Light self-trapping in a large cloud of cold atoms

Details Light self-trapping in a large cloud of cold atoms Light self-trapping in a large cloud of cold atoms

2011-04-11

arxiv.org/abs/1104.1916v1

Physics

Condensed Matter

Quantum Gases

3 pages, 4 figures, submitted to Optics Letters

Scientific paper

We show that, for a near-resonant propagating beam, a large cloud of cold 87Rb atoms acts as a saturable Kerr medium and produces self-trapping of light. By side fluorescence imaging we monitor the transverse size of the beam and, depending on the sign of the laser detuning with respect to the atomic transition, we observe self-focusing or -defocusing, with the waist remaining stationary for an appropriate choice of parameters. We analyze our observations by using numerical simulations based on a simple 2-level atom model.

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